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Sodium hexametaphosphate (SHMP) is a salt of composition Na 6 [(PO 3) 6]. [3] Sodium hexametaphosphate of commerce is typically a mixture of metaphosphates (empirical formula: NaPO 3 ), of which the hexamer is one, and is usually the compound referred to by this name.
The original product consisted of powdered sodium hexametaphosphate (amorphous sodium polyphosphate), which, in water, would complex with ambient calcium ions and certain other cations—preventing formation of unwanted salts and interference by those cations with the actions of soap or other detergents.
Polymeric sodium phosphates are formed upon heating mixtures of NaH 2 PO 4 and Na 2 HPO 4, which induces a condensation reaction. The specific polyphosphate generated depends on the details of the heating and annealing. One derivative is the glassy (i.e., amorphous) Graham's salt (sodium hexametaphosphate).
Sodium triphosphate (STP), also sodium tripolyphosphate (STPP), or tripolyphosphate (TPP), [1]) is an inorganic compound with formula Na 5 P 3 O 10. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. It is produced on a large scale as a component of many domestic and industrial products ...
An example of a compound with such an anion is sodium hexametaphosphate (Na 6 P 6 O 18), used as a sequestrant and a food additive. Chemical properties. Solubility
Sodium trimetaphosphate (also STMP), with formula Na 3 P 3 O 9, is one of the metaphosphates of sodium. It has the formula Na 3 P 3 O 9 but the hexahydrate Na 3 P 3 O 9 ·(H 2 O) 6 is also well known. It is the sodium salt of trimetaphosphoric acid. It is a colourless solid that finds specialised applications in food and construction industries ...
Tetrasodium pyrophosphate, also called sodium pyrophosphate, tetrasodium phosphate or TSPP, is an inorganic compound with the formula Na 4 P 2 O 7. As a salt, it is a white, water-soluble solid. It is composed of pyrophosphate anion and sodium ions. Toxicity is approximately twice that of table salt when ingested orally. [3]
Trimetaphosphate is a cyclic trimer formed by the self reaction of metaphosphate ions. A metaphosphate ion is an oxyanion that has the empirical formula PO − 3. [1] It was first postulated in 1955 [2] but was not observed until 1979, when it was detected by mass spectrometry. [3]
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